Electromagnetic metal-working machine.



No. 779,427. PATENTED JAN. 10, 1905.

, F. W. JBSSOP. ELECTROMAGNETIC METAL WORKING MACHINE.

APPLICATION FILED MAR. 30, 1904.

WITNESSES) [NYE/ T03 A TTORIIEYS.

AAAMQ W A UNITED STATES Patented January 10, 1905.

PATENT OFFICE.

FRANCIS VVOODWARD .TESSOP, OF CLEVELAND, OHIO.

SPECIFICATION forming part of Letters Patent No. 779,427, dated January10, 1905.

Application filed March 30, 1904:. Serial No, 200,715.

To all whmn it may concern;

Be it known that LERANeIs WVOODWARD JEs sor, a citizen of the UnitedStates, residing at Cleveland, county of (Juyahoga, and State of Ohio,have invented a new and useful Improvement in ElectromagneticMetal-l/Vorking Machines, of which the following is a full, clear, andexact description, reference being had to the accompanying drawing,which forms a part of this specification.

My invention relates to metal-working ma chines-such as machines forriveting, punching, shearing, forming, and compressing and moreparticularly relates to machines in which the metal-working operation iseffected by a single stroke.

The invention has for its object to enable the application to thispurpose of an electromagnet.

The invention consists in combining with the die, punch, shears, hammer,or other tool an electromagnet and power multiplying mechanismintermediate thereof, whereby a powerful blow or stroke may be impartedto the tool, and also in certain general and specific details ofconstruction relating to the construction and arrangement of the magnet,multiplying mechanism, containing and supporting frame, and auxiliarymechanism.

In the drawing the figure is a sectional view of a riveting-machineembodying my invention.

(0 represents a cast-iron frame, the body of which is cored out toreceive a brass spool f, carrying on it but insulated from it anelectric solenoid 6. One end of the spool acts as a guide for the steelarmature Z) of the solenold, said armature being of the plunger typeordinarily used in solenoids, and therefore adapted to movein arightline as distinguished from the rotating armature employed in theordinary electric motor. (Z is an annular steel cover-plate bolted tothe frame and abutting against the other end of the spool. c is a steelcore extending within the same end of the spool and having a flangebolted to the coverplate (Z. The spool f, solenoid c, cover-plate (Z,core 0, and plunger 6 form an electromagnet.

The plunger Z) is connected by the links at and pins 91 and 0 with themiddle joint of a toggle formed of the links 1) and q, the links 1 beingconnected to the frame by pin 7' and the links q being connected to theram 6 by pin 8. The ram is movable in a guide in the frame a.

is a switch, the two members of which are connected by conductors g gwith the terminals of the solenoid a.

H are the terminals of the line-circuit,adapt ed to be respectivelyconnected with the conductors g r by means of the switch.

\Vhen the switch 7b is closed, the solenoid c is energized, attractingthe plunger Z) to the core 0, pulling the links q of the togglejointinto alinement with each other and with the ram 25, thus forcing thelatter down. To retract the plunger, 1 provide the following means:Within the plunger and extending from its inner end toward its outer endand along its longitudinal center is bored an orifice m. A similarorifice extends through the longitudinal center of core 0. m is a springseated in orifice a" in the plunger. 2' is a bronze bridging-piece, oneend of which extends into the orifice on, while the other end extendsinto the orifice y in the core. in is a plug closing the outer end ofthe orifice y. 2 is a spring confined in the orifice 1/ between thepiece z' and the plug h. hen the switch 71, is closed, as beforedescribed, the inward movement of the plunger 7) compresses springs wand y. hen the switch is opened, the springs expand, acting upon piece71 and reacting upon plunger 7) and plug 7 of core 0 and restoring theplunger and ram to their normal positions. The hole 7; in plug 71 isadapted to relieve the air-pressure.

The ram 25 is shown adapted for performing the operation of riveting bybeing tipped with a concave steel set a for forming the rivetheads,while the lower angular arm .2 of the frame a is provided with ascrew-threaded orifice in which is secured an adjustable holder w,carrying a steel die 0.

It will be understood that any desired toolsuch as a shear-blade, apunch, or a formingtool may be secured to the ram 25 and a suitablebottom piece substituted for the die a.

\Vhile electromagnetic power has heretofore been adapted to theoperation of a metall working tool, its use has either been confined tothe purpose of holding the frame of the machine in position to do thework or else when it has been adapted to actuate the riveting-set it hasbeen directly secured thereto and the riveting effected by repeatedlight blows, as it is impracticable to build a directly-connectedelectromagnet strong enough to do heavy work by a single stroke. In myin vention,however,the interposition of powermultiplying mechanism, suchas the togglelevers p q and link m, enables a powerful, short, and rapidstroke to be transmitted to the ram by means of an electromagnet ofpracticable strength. It will be understood, however, that my inventionis not confined to an embodiment wherein the toggle-levers are utilizedas amultiplying medium. as any suitable equivalent therefor may beemployed. Indeed, the machine hereinbefore described possesses othernovel features of construction and arrangement which will be foundavailable for use whether the metal-working tool is directly connectedwith the plunger or connected therewith by means of m ultiplying-levers;nor is my invention confined to the details of construction andarrangement shown. For example, the invention is not restricted to theemployment of a tension device for returning the plunger nor to thespecific construction and arrangement of springs shown.

Having now fully described my invention, what I claim, and desire toprotect by Letters Patent, is

1. The combination, with the frame, of a ram carried by said frame, anelectromagnet having a plunger-armature, and power-multiplying mechanismbetween said magnet and ram.

2. The combination, with the frame, of a ram carried by said frame, anelectromagnet, and toggle-levers interposed between said magnet and ram.

3. The combination, with the frame, of a ram movable in a guide in saidframe, an electromagnet, toggle levers, one connected to the frame andthe other to the ram, and a link connecting the plunger of theelectromagnet with the joint of the toggle.

4. The combination, with the frame, of a ram movable therein, anelectromagnet, the plunger of which is connected with said ram, and atension device tending to hold said plunger in its inoperative position.

5. The combination, with the frame, of a ram movable therein, anelectromagnet, powermultiplying mechanism between said magnet and ram,and a tension device adapted to restore said ram to its normal position.

6. The combination, with the frame, of a ram carried thereby, asolenoid, a plunger adapted to be energized by said solenoid,toggle-lever power-transmitting mechanism between said plunger and ram,and a tension device acting in opposition to said solenoid.

'Z. The combination, with the frame, of a ram movable in a guide in saidframe, a solenoid in said frame, a stationary core extending within saidsolenoid, a plunger partly within and partly without said solenoid andadapted to be actuated thereby, said plunger being connected with saidram, and a tension device interposed between said core and plui'iger.

8. The combination, with the frame, of a ram, a solenoid supported insaid frame, a stationary core extending within said solenoid, a plungeralso extending within said solenoid and adapted to be energized thereby,said core and plunger each having an orifice, a spring seated in eachorifice, and a piece bridging the space between said core and plunger,one end thereof extending into the core and abutting against the springconfined therein, and the other end extending into the plunger andabutting against the spring confined in the latter.

9. The combination, with the frame, of a spool confined therein, asolenoid carried on and insulated from said spool, an annularcover-plate secured to the frame and abutting against said spool, astationary core extending through said cover-plate and within said spooland abutting against and secured to said cover-plate, a plungerextending within said spool and adapted to be actuated by the energizingof said solenoid, a tension device confined between said core andplunger, and a ram connected with and adapted to be operated by saidplunger.

10. The combination, with the frame, of a spool confined therein, asolenoid carried on and insulated from said spool, an annularcover-plate secured to the frame and abutting against said spool, astationary core extending through said cover-plate and within said spooland abutting against and secured to said cover-plate, a plungerextending within said spool and adapted to be actuated by the energizingof said solenoid, said core and plunger each having an orifice, a springseated in each orifice, a piece bridging the space between said core andplunger and extending into said orifices and abutting against saidsprings, and a ram connected with and adapted to be operated by saidplunger.

11. The combination, with a frame having an angular arm extending belowits main body, the solenoid and plunger of an electromagnet, the body ofsaid frame being cored out to receive the same, a ram slidable in aguide in the overhanging end of the body of the frame, the fixed andmovable tools, the latter carried by said ram and the former by saidarm, and power-multiplying mechanism between said plunger and ram.

12. The combination, with a frame having an angular arm extending belowits main body, the solenoid and plunger of an electromagnet, the body ofsaid frame being cored out to re ceive the same, a ram slidable in aguide in the overhanging end of the body of the frame,

the fixed and movable tools, the latter carried by said ram and theformer by said arm, power-multiplying mechanism between said plunger andram, and a tension device acting upon said plunger in opposition to saidsolenoid.

13. The combination with a frame having an angular arm extending belowits main body, the solenoid and plunger of an electromagnet, the body ofsaid frame being cored out to receive the same, a ram movable in a guidein the overhanging end of the body of the frame, toggle-levers the endswhereof are attached respectively to said frame and ram, a linkconnecting the joint of the toggle with the ram, a tension device actingupon said plunger in opposition to said solenoid, a movable tool carriedby said ram, and a fixed tool carried by said extending arm.

14:. The combination, with a frame having an angular arm extending belowits main body, the body of the frame being cored from end to end, aspool inserted in the cored-out portion of said frame, a solenoidcarried thereby,

an annular cover-plate secured to the frame and abutting against saidspool, a core extending within said spool and through said coverplateand secured to the latter, a plunger extending within said spool andadapted to be actuated by said solenoid, springs seated in orifices insaid core and plunger, a bridgingpiece between said core and plungerextending into said orifices and engaging said springs, a ram movable ina guide in the outer end of the overhanging portion of said body,togglelevers connected respectively to said frame and ram, a linkconnecting said plunger with the joint of the toggle, a tool secured tosaid ram, and a tool secured to the end of said angular arm.

In testimony of which invention Ihave here unto set my hand, atCleveland, on this 12th day of March, 190 1.

FRANCIS WOODWARD JESSOP.

Witnesses:

G. W. GoMs'roox, JAY H. HALL.

